જો $\frac{\sec 8\theta - 1}{\sec 4\theta - 1} = \frac{a + b \tan^2 2\theta}{1 + c \tan^2 2\theta + d \tan^4 2\theta}$ (જ્યાં $\theta \neq \frac{n\pi}{16}, n \in I$),તો $(a - b + c - d)$ ની કિંમત શોધો.

  • A
    $0$
  • B
    $1$
  • C
    $7$
  • D
    $13$

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જો $\cos A = \frac{3}{4}$ હોય,તો $32 \sin \left(\frac{A}{2}\right) \sin \left(\frac{5A}{2}\right) = $

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